Table 2. Frequency of the ATGAC sequences in extended RPE-4s (eRPE-4s).

Regions	Category of eRPE-4		Length (bp)	Amount of ATGAC	Frequency (per kb)
eRPE-4	eRPE-4 including RPE-4	Total	2,243	35	15.6
		RPE-4	806	27	33.5
		Extended	1,437	8	5.6
	eRPE-4 including RPE-6	Total	1,805	35	19.4
		RPE-6	1,235	20	16.2
		Extended	570	15	26.3
	eRPE-4 including RPE-7	Total	2,291	33	14.4
		RPE-7	878	18	20.5
		Extended	1,413	15	10.6
	eRPE-4 without RPE-4,6,7	Extended	3,565	17	4.8
RPE-1,-2,-3,-5		24,452	3	0.1
Other regions		1,248,731	2,311	1.9
Whole genome of R. japonica		1,283,087	2,417	1.9

ND: Not detected.